Screenshot or capture flows

In addition to the above suggestions, you can:

Though it requires some more effort, the advantage of the PDF-method is that you can always see what flowcards and which variables/tags you had in your flow after the related device/app/variable has been removed from your Homey.

Keep in mind that after removing a device/app/variable, Homey replaces the related flowcards and tags with greyed out ‘unavailable’ message. It is then difficult to determine what the original flowcard/tag/variable was. This is also the case if you import a flow that contains flowcards of apps/devices that are not available anymore.

Further, If you want to keep multiple backup versions of your flows and maintain a recycle bin of deleted flows, make sure to check out the Flow Version History app by @smarthomesven.