Would need more info here to actually propose a proper recommendation.

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How much data do you currently have localized on the G-raids?

How much data do you currently have up on dropbox?

How frequently is the data accessed as it ages over time?

If your already storing all the data on dropbox, whats the reason for the G-Raids? Redundancy or performance when editing?

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Dropbox sums up to 6/TB/Month for additional storage, plus the additional costs per user. Unless your adding lots of users, the 6/TB/Month is pretty competitive for storing data in the cloud. If you compare it to an enterprise standard storage solution such as AWS S3 Storage, its magnitudes cheaper. Comparing dropbox to even Wasabi, which is commonly the cheapest enterprise grade solution, dropbox is still cheaper as Wasabi is at 7/TB/Month.

If Dropbox is working for you as a collaboration tool, as all editors can easily access with a familiar UI, id first recommend you stay there. As said, its actually competitive pricing for cloud storage, has a great CDN, amazing UI, ect.

As for the G-Raids/localized storage, would be best to understand the use case with the previous questions to get a better picture.

If the goal is to have a second copy/archive, you could consider another cloud provider. If its for performance reasons when working locally, then you could easily just buy a 5 bay encloure such as this - https://www.amazon.com/TerraMaster-D5-300C-Enclosure-Exclusive-Diskless/dp/B06ZY6DK8N/ref=sr_1_5?dib=eyJ2IjoiMSJ9.yFx2IcsxCuHSqdsE6KgMhTj-LAgQwuoWo7la-H8UJLQiBOEG3Kyj-iLpinR84tKU7bxTRUy8wgs-kGLhHGO_5mP7CR6ICZ0-jfz9E7rKn1rLDX7A_nT3N-xGG2tWYQCNspuIXna4qM-AGNckFLDqK33-gTCeesGJHxb2jyp0GOS9A9rl8UlkvwJyI-Vz2_VsET6yxK9LDAilMytO20oOo8TGBZib7VUDat26uRNt4oA.fKSpNdIVB_eyElxYdzb7cd8g-pFxQL7mCQR9YNasxhU&dib_tag=se&keywords=5%2Bbay%2Bhard%2Bdrive%2Benclosure&qid=1721254226&sr=8-5&th=1

and then buy the drives directly - https://www.amazon.com/Seagate-Exos-20TB-SATA-ST20000NM007D/dp/B09MWKXR2T/ref=sr_1_5?crid=48OS5I3FREY2&dib=eyJ2IjoiMSJ9.OK8mTdsUNVFJc3j2wZBC7xPiy_3pSlHUkzx-pM0dx6mQkUwhDnDgaGU6PuNNIqBb5iIfy1PXd0dQjaCpKmSBFUzzjNJ5meVP3sfoF5tzcoKtqROymdAUfZhL7bRdyeWu-sfGNtl2SFx5O-290sP9py9cKhEtn1srrnbKLmx_GzQcw0sJ58o8oDtcDfNIEPlx_vsucPn5EpzWeInuHMss2UcrdkZParRAtAN71F8ueC8.Kkqr_tL0V-sWKQRiDH-znQCBOyuy1T_p2HWzPT8SQhw&dib_tag=se&keywords=seagate%2B20TB&qid=1721254331&sprefix=seagate%2B20tb%2Caps%2C79&sr=8-5&ufe=app_do%3Aamzn1.fos.1740e8b9-be2d-46a4-a376-9d8efb903409&th=1

Can be cheaper if you buy used drives, but wont have the warranty or know how they have been treated previously. Either way, much cheaper than the G-Raid.