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backup stuck on "calculating time remaining"

I am trying to back up my Macbook 2015 for the  first time. I am using an external drive that used to work on My Imac. Time machine is stuck on "calculating time remaining" for several hours. The backup data is not that big, around 70GB.

I have performed the following checks

-restarted the mac first

-erased the backup partition, and started with a fresh one

-tested copying a file to the backup partition. I can copy a single file, but i am prompted for credentials. It appears the partition is set to everyone read only, system read and write(is this normal for backup partitions?)

-tested the drive performance on another partition (comes up as 36 MB/s read/write, which is fine for a USB 2.0 laptop HD)

what further checks can i make?

If a Time Machine backup takes longer than you expect - Apple Support

Are you doing the backup manually?  Reformat the EHD and set the access to that shown in this screenshot and set the ownership to be ignored:

If you're doing the backup manually perhaps you should consider using a backup app that does incremental backups, i.e. copying only those new or modified files.  It certainly speeds up the backup process.  Apps that can to that include SuperDuper, Carbon Copy Cloner and ChronoSync.

最后更新：2017-09-25 02:33:54

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