Two rsync bugs found during Immich cross-drive backup testing:
Fix 3: Simplified destination path structure in runRsyncBackup.
Old SplitN logic kept "storage/immich" as a subpath, creating redundant
nesting: backups/rsync/immich/storage/immich/<data>. New logic: single
mount → rsync directly into the stack folder; multiple mounts → use
each mount's leaf dir name as subfolder (disambiguated by _N suffix).
Fix 4: Exclude app-internal DB dump files from rsync. Apps like Immich
store periodic pg_dumps in <data>/backups/*.sql.gz. The controller
already handles DB backups via pg_dump — copying them again wastes space.
Added --exclude backups/*.sql.gz/sql/dump to the rsync command.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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