One of method of restorage of postgresql server is file level backup of folder of working server. For this i try ti use arj with key:
arj a -a1 -m3 -r -y -e1 -jt
in result while unarj occur "crc - bad file error".

list of file with "crc - bad file error" is different in arj-unarj cycle with same folder. May be reason of it is - some file of server data is open.

how arj folder with opened files