OK, from inside the jail this time. I had to install ncdu inside the jail, which happily went fine even though the NAS was reporting the disk 100% full.
root@pms:/tmp # diff files100.txt filesNormal.txt
1c1
< [1,2,{"progname":"ncdu","progver":"1.18.1","timestamp":1693041117},
---
> [1,2,{"progname":"ncdu","progver":"1.18.1","timestamp":1693041425},
3c3
< [{"name":"sbin","dev":687931148,"excluded":"othfs"}],
---
> [{"name":"sbin","dev":687931165,"excluded":"othfs"}],
5c5
< [{"name":"lib","dev":687931145,"excluded":"othfs"}],
---
> [{"name":"lib","dev":687931162,"excluded":"othfs"}],
7c7
< [{"name":"libdata","dev":687931155,"excluded":"othfs"}],
---
> [{"name":"libdata","dev":687931172,"excluded":"othfs"}],
9c9
< [{"name":"libexec","dev":687931152,"excluded":"othfs"}],
---
> [{"name":"libexec","dev":687931169,"excluded":"othfs"}],
117731,117734c117731,117734
< [{"name":"bin","dev":687931149,"excluded":"othfs"}],
< [{"name":"lib32","dev":687931156,"excluded":"othfs"}],
< [{"name":"lib","dev":687931151,"excluded":"othfs"}],
< [{"name":"share","dev":687931154,"excluded":"othfs"}],
---
> [{"name":"bin","dev":687931166,"excluded":"othfs"}],
> [{"name":"lib32","dev":687931173,"excluded":"othfs"}],
> [{"name":"lib","dev":687931168,"excluded":"othfs"}],
> [{"name":"share","dev":687931171,"excluded":"othfs"}],
118519,118521c118519,118521
< [{"name":"include","dev":687931150,"excluded":"othfs"}],
< [{"name":"sbin","dev":687931153,"excluded":"othfs"}]],
< [{"name":"bin","dev":687931143,"excluded":"othfs"}],
---
> [{"name":"include","dev":687931167,"excluded":"othfs"}],
> [{"name":"sbin","dev":687931170,"excluded":"othfs"}]],
> [{"name":"bin","dev":687931160,"excluded":"othfs"}],
118523c118523
< [{"name":"Logs","asize":43,"dsize":44032},
---
> [{"name":"Logs","asize":44,"dsize":44032},
118560c118560
< {"name":"com.plexapp.system.log.5","asize":173365,"dsize":44032},
---
> {"name":"com.plexapp.system.log.5","asize":41992,"dsize":16896},
118605c118605
< {"name":"com.plexapp.system.log","asize":46812,"dsize":16896},
---
> {"name":"com.plexapp.system.log","asize":33491,"dsize":16896},
118610c118610
< {"name":"com.plexapp.system.log.3","asize":157678,"dsize":44032},
---
> {"name":"com.plexapp.system.log.3","asize":46812,"dsize":16896},
118624c118624
< {"name":"com.plexapp.system.log.4","asize":41992,"dsize":16896},
---
> {"name":"com.plexapp.system.log.4","asize":157678,"dsize":44032},
118635a118636
> {"name":"Plex Media Server.5.log","asize":10485790,"dsize":1643008},
118638c118639
< {"name":"Plex Media Server.2.log","asize":10485772,"dsize":1637376},
---
> {"name":"Plex Media Server.2.log","asize":10485830,"dsize":1697280},
118644c118645
< {"name":"Plex Media Server.3.log","asize":10485829,"dsize":1740800},
---
> {"name":"Plex Media Server.3.log","asize":10485772,"dsize":1637376},
118646c118647
< {"name":"Plex Media Server.4.log","asize":10485790,"dsize":1643008},
---
> {"name":"Plex Media Server.4.log","asize":10485829,"dsize":1740800},
118661c118662
< {"name":"Plex Media Server.log","dsize":512},
---
> {"name":"Plex Media Server.log","asize":67786,"dsize":16896},
118664c118665
< {"name":"Plex Media Server.1.log","asize":10485830,"dsize":1697280},
---
> {"name":"Plex Media Server.1.log","dsize":512},
137542c137543
< {"name":"com.plexapp.plugins.library.db","asize":26352640,"dsize":10726912},
---
> {"name":"com.plexapp.plugins.library.db","asize":26354688,"dsize":10721792},
137544,137545c137545,137546
< {"name":"com.plexapp.plugins.library.db-shm","asize":229376,"dsize":16896},
< {"name":"com.plexapp.plugins.library.db-wal","asize":25781880,"dsize":10770432},
---
> {"name":"com.plexapp.plugins.library.db-shm","asize":32768,"dsize":16896},
> {"name":"com.plexapp.plugins.library.db-wal","asize":25781880,"dsize":10754048},
138811c138812
< {"name":"dhclient.leases.epair0b","asize":5880,"dsize":6144},
---
> {"name":"dhclient.leases.epair0b","asize":840,"dsize":6144},
139898c139899
< {"name":"auth.log","asize":231,"dsize":6144},
---
> {"name":"auth.log","asize":288,"dsize":6144},
139900c139901
< {"name":"messages","asize":59352,"dsize":16896},
---
> {"name":"messages","asize":59856,"dsize":16896},
139907c139908
< {"name":"utx.log","asize":231,"dsize":6144},
---
> {"name":"utx.log","asize":336,"dsize":6144},
139915c139916
< {"name":"cron","asize":578359,"dsize":136704},
---
> {"name":"cron","asize":578511,"dsize":136704},
139917c139918
< {"name":"daemon.log","asize":540345,"dsize":82432},
---
> {"name":"daemon.log","asize":540730,"dsize":82432},
140815c140816
< {"name":"cron.pid","asize":4,"dsize":512},
---
> {"name":"cron.pid","asize":5,"dsize":512},
140819c140820
< {"name":"syslog.pid","asize":4,"dsize":512},
---
> {"name":"syslog.pid","asize":5,"dsize":512},
140826,140827c140827,140828
< {"name":"plex-server.pid","asize":4,"dsize":512},
< {"name":"plex-daemon.pid","asize":4,"dsize":512}],
---
> {"name":"plex-server.pid","asize":5,"dsize":512},
> {"name":"plex-daemon.pid","asize":5,"dsize":512}],
140836c140837
< {"name":"dhclient.epair0b.pid","asize":4,"dsize":512}]],
---
> {"name":"dhclient.epair0b.pid","asize":5,"dsize":512}]],
140845c140846
< [{"name":"dev","dev":1895890710,"excluded":"othfs"}],
---
> [{"name":"dev","dev":1895890727,"excluded":"othfs"}],
140850c140851
< {"name":".history","asize":185,"dsize":6144},
---
> {"name":".history","asize":232,"dsize":6144},
140856c140857
< [{"name":"libexec","dev":687931146,"excluded":"othfs"}],
---
> [{"name":"libexec","dev":687931163,"excluded":"othfs"}],
140859,140860c140860,140861
< [{"name":"rescue","dev":687931147,"excluded":"othfs"}],
< [{"name":"tmp","asize":33,"dsize":44032},
---
> [{"name":"rescue","dev":687931164,"excluded":"othfs"}],
> [{"name":"tmp","asize":35,"dsize":44032},
140879c140880
< {"name":"files100.txt","asize":7602176,"dsize":512},
---
> {"name":"files100.txt","asize":7717300,"dsize":2471936},
140900a140902
> [{"name":"pms-83f75712-08b6-493c-9d60-8aa52cfd9c20","asize":2,"dsize":512}],
140916a140919
> {"name":"filesNormal.txt","asize":7602176,"dsize":512},
140920,140921c14