Problem: When syncing Souce/Target and must deleting many files, rsync stop still quiet with Error-Code: "22 - Error allocating core memory buffers" Desc: When more than ~5-10 million files to delete, rsync ends still quiet, in case of deleting process. Rsync reads (with --delete-before) the complete Source and breaks than after deleting many (>1000) files on Target. Else, (withOUT --delete-before), he does some sync on Target and some deletes, some sync ... and breaks than after delete some files. In case of this, Backups are not synced, and may space overflow after next backup run. Use of ‐‐max‐delete=100.000.000 are not functional to solve this Command: rsync -vaxHSPAX --delete [--delete-before] $SOURCE $TARGET # $SOURCE, $TARGET are real directorys or remote (ramote:dir...) Versions: It tested fail with: * rsync version 3.2.3 protocol version 31 * rsync version 3.2.7 protocol version 31