A high-capacity external solid state drive keeps your massive video files and daily backups safe, fast, and ready to move. If you pick the right capacity today, you are buying once and avoiding the slow, painful upgrade cycle of replacing a too-small drive in two years.
Timing matters here because storage prices drop fast when manufacturers refresh their lineups. Wait for Prime Day events to grab last year's model at a steep discount, since the speed bump on the newest version usually is not worth the extra cash.
That 18-month window is a hard deadline, not free money, so make sure you track the end date. If you still have a balance left when the clock runs out, deferred interest or standard rates will kick in and wipe out your savings.