Once in action dar makes all the system slower and slower, then it stops with the message “killed”! How to overcome this problem?
Dar needs virtual memory to work. Virtual memory is the RAM + SWAP space. Dar memory requirement grows with the amount of file saved, not with the amount of data saved. If you have a few huge files you will have little chance to see any memory limitation problem. At the opposite, saving a plethora of files (either big or small), will make dar request a lot of virtual memory. Dar needs this memory to build the catalogue (the contents) of the archive it creates. Same thing, for differential backup, except it also needs to load in memory the catalogue of the archive of reference, which most of the time will make dar using twice more memory when doing a differential backup than a full backup.
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