Can I use an SD card as a time machine back up?

If you search this forum, you'll find numerous threads of problems with cards. They are incredibly slow, easy to lose and unreliable.

Get a real HDD to protect your data, not some trouble prone little card.

RandyK56 wrote:

I just want to know if I can use an SD card as a time machine backup drive

Here are the types of drives supported by Time Machine: Backup disks you can use with Time Machine - Apple Support

Using a SD Card is not a good idea for reliability reasons.

My opinion on this is it's an exceedingly bad idea. The cards are small, easy to lose, often have accessability problems and are just simply unreliable.

There is simply no comparison for these little trinkets up against a real drive either HDD or SSD.

I don't believe SD cards support TRIM Trim (computing) - Wikipedia

and if they don't they will wear down much faster than the disc it's suppose to backup, which is not ideal

sd cards are much slower Speed Class | SD Association (sdcard.org)

only the fastest ones are as fast as the average mechanical hard disk