2021-09-20T22:56:43+01:00 Zend_Feed_Writer https://www.augwessex.org.uk/discussions/view/2003 AUGW info@augwessex.org.uk https://www.augwessex.org.uk/ 2021-09-19T17:25:25+01:00 https://www.augwessex.org.uk/discussions/view/2003#9911 Richard I info@augwessex.org.uk https://www.augwessex.org.uk/ I decided to start using a second TM backup disk. I opted for the disk to be encrypted. The backup was reasonably quick, given that it was a full backup of about 250Gbytes -but then it said 'encrypting...' and has only got to 46% after about 7 hours!! Is this normal? I guess it is disk access intensive, but 7 hours...! Any suggestions welcome... 2021-09-20T18:09:35+01:00 https://www.augwessex.org.uk/discussions/view/2003#9912 Tony Still info@augwessex.org.uk https://www.augwessex.org.uk/ Those sorts of times are usually associated with encrypting a disk that already contains a lot of data (which may or may not be TM backups). The trick is to encrypt the disk while it's empty, the additional time encrypting data written/read is negligible at the time of writing/reading (there's substantial hardware support for encryption). The mystery is why your disk is being encrypted after the backup. Where did you ask to encrypt the disk? 2021-09-20T19:17:27+01:00 https://www.augwessex.org.uk/discussions/view/2003#9914 Richard I info@augwessex.org.uk https://www.augwessex.org.uk/ With a newly formatted disk, I opened TM preferences, clicked 'add or remove a backup disk'. The next window allows you to select the disk for TM and in the bottom LH corner there is a tick box for 'encrypt backups'. So I assumed that it would encrypt the disk then do the TM backup -but no! BTW, the encryption phase lasted over 12 hours (I went to bed at 85%). A clue perhaps is that when the machine was awake the light on the disk flashed rapidly, but when asleep it flashed slowly. I tried various things* in the energy saver window of system preferences, but none seemed to stop the mac sleeping, even though it was always on mains power. *untick 'put HDs to sleep when possible. 'untick prevent computer from sleeping...' tried both settings of 'power nap...' 2021-09-20T22:56:43+01:00 https://www.augwessex.org.uk/discussions/view/2003#9915 Tony Still info@augwessex.org.uk https://www.augwessex.org.uk/ What is actually happening seems clear (!): the first backup was written unencrypted and was then encrypted afterwards. Very strange. I have always formatted my backup drives as encrypted before using them. Doing that was partly because I didn't entirely understand what TM would do for 'encrypt back-ups' and I did want the entire disk encrypted. I now claim inspiration and recommend that approach as easier to understand and lacking this strange behaviour. Can anyone else shed any light on TM's apparently odd behaviour?