APFS and disk changes

Mac|Life - - FEATURE -

The de­vel­oper of Car­bon Copy Cloner (CCC) found a se­ri­ous prob­lem with APFS-for­mat­ted sparse disk im­ages. This kind of im­age is de­signed to ex­pand as data is added, up to the limit of the vol­ume on which it’s stored. How­ever, APFS-for­mat­ted sparse disk im­ages fail to track free space ac­cu­rately, and so al­low stor­age op­er­a­tions to con­tinue even if there isn’t room on the un­der­ly­ing vol­ume.

A file might seem to copy to an im­age, but re­mount­ing the im­age will re­veal the file is cor­rupted or miss­ing. CCC has re­moved sup­port for this type of im­age. But, if you cre­ate sparse disk im­ages us­ing Disk Util­ity — say, to keep an en­crypted and pass­word-pro­tected copy of your tax re­turn in the cloud — stick with Mac OS Ex­tended for­mat.

A spe­cific kind of disk im­age, when for­mat­ted as APFS and get­ting full, runs the risk of los­ing data.

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